Grammatically speaking, the title should read "5 Weird Things for Which to be Thankful" to avoid the dangling preposition but I thought you wouldn't read it with such a fancy title. You're thankful for your family, friends, health, etc., but what about those odd ball things in your life that helped you grow? What about small things that seemed annoying or insignificant at the time, but they made you think differently, or brought someone new into your life?